Abstract: A sheet surface cleaing apparatus for cleaning the surface of a sheet on which painting or printing is to be conducted. The apparatus has a rotatable dust removing roll having a sticky surface capable of making rolling contact with the sheet surface to be cleaned. The apparatus also has a roll cleaning device mounted for movement parallel with the axis of rotation of the dust removing roll and capable of cleaning the surface of the dust removing roll. The dust removing roll is mounted for swinging movement between a position where it engages the roll cleaning device and a position where it engages the sheet surface. The surface of the roll cleaning device contactable with the dust removing roll is formed of a flexible porous cleaning pad which is mounted so as to be delivered in a direction perpendicular to the axis of rotation of the dust removing roll.

Abstract: A carbon steel useful for machine structural use having improved cold forgability and induction hardenability comprises particular amounts of C, Si, Mn, Cr, S, P, O, N or further Mo and the balance being substantially Fe.

Abstract: The magnetic properties, particularly magnetic flux density of a grain oriented silicon steel sheet are considerably improved by continuously and/or stepwise forming regions, wherein a temperature difference of a secondary recrystallization starting temperature in widthwise direction and/or longitudinal direction of the steel sheet is within a range of 10.degree. C. to 200.degree. C., in the steel sheet at a stage before the secondary recrystallization annealing step.

Abstract: A laminar flow cooling system employs a laminar flow nozzle comprising a pair of plate members defining slit through which cooling water flows to form a cooling water screen. One of the plate members of the laminar nozzle is deformable at least in a direction perpendicular to the cooling water flow direction to adjust the path area in the nozzle. At least one of the plate member is preferably responsive to the cooling water pressure to cause variation of the path area for adjusting the cooling water path area.

Abstract: A process is provided for the production of a sintered body. The process includes the following consecutive steps: (i) mixing and kneading one or more metal powders and/or one or more alloy powder with a binder into a compound, said metal and alloy powders having an average particle size not greater than 30 .mu.m, (ii) injection-molding the compound into a green body; (iii) debinding the green body to form a debound body; and (iv) subjecting the debound body to first-stage sintering at 1,050.degree.-1,250.degree. C. in a reducing or reduced-pressure atmosphere and then to second-stage sintering at a temperature in a range of 1,100.degree.-1,400.degree. C. which is higher than that of the first-stage sintering. This process can provide sintered Ti bodies and sintered magnetic bodies of the Fe-Si type, which have a density ratio of at least 95%.

Abstract: A grain oriented electromagnetic steel sheet having a very low iron loss is obtained by subjecting a surface of base metal in the sheet after finish annealing to a particular mechanical polishing and has a surface roughness having a center-line average roughness of not more than 0.3 .mu.m after the polishing and the number of abrasive grains embedded in a layer just beneath polished surface of not more than 20,000 grains/cm.sup.2.

Abstract: Provided herein are high-strength high-toughness sintered alloy steel and composite alloy steel powder useful for the production thereof. The sintered alloy steel contains, as the alloy components in the final product, Ni, Mo, and/or W, and C, if necessary, said alloy being composed of 0.50-3.50 wt % of Ni, 0.65-3.50 wt % of Mo+1/2W, (and 0.3-0.8 wt % of C, if necessary), and the remainder of Fe and inevitable impurities, and has a density higher than 7.0 g/cm.sup.3 and a tensile strength higher than 130 kgf/mm.sup.2 after quenching and tempering. The composite alloy steel powder is composed of iron powder particles and powdery alloy components attached by diffusion to part of the surface of the iron powder particles, with the content of Ni and the content of Mo+1/2W in the steel powder of particle diameter smaller than 45 .infin.m being in the range of 2.0-4.2 times the average content in the entire steel powder.

Abstract: A continuous casting process introduces the factor of rate temperature change for detecting break out in the cast metal. Introduction of rate of temperature change as a parameter representative of the cast metal condition is successful for avoiding the influence of variation of the casting condition, fluctuation of the powder to be introduced between the casting mold wall and the cast metal, casting speed and so forth. For achieving accurate detection of break out of the cast metal by introducing the temperature change factor, casting mold wall temperatures are measured at various measuring points which are circumferentially aligned. Rates of temperature change at each measuring point and average rate of temperature change of all measuring points are derived and compared for making judgement of possible break out when the difference of the rate of temperature change at each measuring point and the average rate of temperature change becomes greater than a predetermined value.

Abstract: An apparatus for effecting, on a metallic member, an electrolytic process such as descaling, electrolytic acid cleaning, passivation, electrolytic polishing, coloring or plating. The apparatus comprises a rotatable cylindrical electrode arranged to oppose the member to be processed, with a gap between them, a paste electrolyte supply device for introducing a paste electrolyte into the gap between the cylindrical electrode and the metallic member, a pad disposed on the outer peripheral surface of the cylindrical electrode and capable of retaining by impregnation the paste electrolyte supplied by the paste electrolyte supply device; an electrical power supply device for causing an electric current to flow between the cylindrical electrode and the member across the paste electrolyte; and a moving device for effecting relative movement between said metallic member and said cylindrical electrode.

Abstract: An iron base powder mixture for powder metallurgy, comprising an iron based powder and an alloying powder and/or a powder for improving machinability, wherein the alloying powder and/or the powder for improving machinability are adhered to the surface of the ferrous powder by means of a melted-together binder composed of an oil and a metal soap or wax.

Abstract: A cutting device for collecting a quantoback analysis sample in a hot state from a preferred position of a continuously cast steel piece is disclosed. According to this invention, a dish like recess is cut on the surface of a cast steel piece while leaving a center column, then the root of the center column is cut and the cut free portion taken out as a sample.

Abstract: A black colored steel strip having improved degree of blackness and uniform appearance is prepared by subjecting a Zn-Ni alloy plated steel substrate to anodic electrolysis or alternating current electrolysis in an electrolyte solution containing at least one member selected from the group consisting of hydroxide, sulfate, and chloride of sodium, potassium, or nickel; nitrate ion; and at least one member selected from an inhibitor and a complexing agent.

Abstract: A method of continuous compression forging, with a compression forging anvil, the final solidified region of cast steel drawn out from a mold for continuously casting, comprising the step of: compressing said cast steel with said anvil at a compressing cycle which meets the following conditions: ##EQU1## where t: the compressing cycle (sec), .delta.: the overall thickness reduction, Vc: the casting speed (mm), D: the cast steel thickness before compression forging, .theta.: the inclination angle (.degree.) with respect to the flat surface of the anvil.

Abstract: A catalyst comprising an inert support that carries on it vanadium oxide, sodium oxide and molybdenum oxide in predetermined amounts, at least one additional component in a predetermined amount which is selected from among chromium oxide, manganese oxide, niobium oxide and titanium oxide is capable of producing pyromellitic dianhydride in high yield from inexpensive durene over a broad optimal temperature range while suppressing the generation of heat in the catalyst bed.

Abstract: A segregation preventive or eliminative operation in a continuous casting process is performed under the following conditions:The solidified/unsolidified ratio of the solidifying block is in a range of 0.5:1 to 0.9:1;The ratio between the overall compression .delta. (mm) versus thickness of the unsolidified area in the block (d mm) is greater than or equal to 0.5 or the thickness (d mm) of the unsolidified layer in the solidifying block is: ##EQU1## where D is the thickness of the block before compression. Casting speed may be controlled according to thickness of the solidifying shell at or near a crater end. Preferably, electromagnetic stirring is performed before performing compression forging.

Abstract: A process of production of chromium containing molten iron generally comprises two steps. In a first step, top and bottom-blown reduction for reducing chromium is performed with charging carbon containing material and slag forming agent from the top of a converter for melting stainless scrap and for rising temperature of molten iron bath. In a second step which is performed subsequently to the first step, top and bottom-blown injection with charging chromium oxide and carbon from the top of the converter for reduction of chromium.

Abstract: The iron loss is reduced by irradiating plasma flame to the surface of the grain oriented silicon steel sheet, wherein the irradiation interval (l) of plasma flame is controlled so as to satisfy the following equation (1):22-2.5D.ltoreq.l.ltoreq.36-2.5D (1)(D is an average secondary recrystallized grain size of the steel sheet).

Abstract: A burden distribution monitoring apparatus, according to the present invention, includes a hollow cylindrical sonde having an inner end radially movable within the internal space of a furnace, such as a shaft furnace. The sonde carries a burden layer depth sensor and/or a burden grain distribution sensor for radially shifting working ends of the sensors. With the foregoing construction, burden depth and/or grading of the burden can be monitored in a plurality of radial points in the furnace.

Abstract: A method for operating a shaft furnace is performed by charging different ore/coke ratio mixture in radially different positions in the furnace. The ore/coke mixture ratio may be determined according to desired heat distribution in radial direction. For this, at least two mutually independently determined ore/coke mixture ratio mixtures are provided in each charge cycle of the burden. The mixture to be charged in the central portion of the furnace may have a higher coke content or a lower ore content for better permeability to the heating gas.

Abstract: An extra-low iron loss grain oriented silicon steel sheet is produced by irradiating electron beam to an insulation coating formed on a grain oriented silicon steel sheet after finish annealing in a direction crossing the rolling direction of the sheet, whereby the magnetic properties are not degraded even if the steel sheet is subjected to a strain relief annealing. If necessary, an inert gas may be introduced into the vicinity of electron beam irradiated zone of the coating.